Lacquering machine and oven



April 8, 1930. A. PotiEL LACQUERING MACHINE AND OVEN 6 Sheets-Sheet 1Filed Oct. 18, 1924 IN VENTOR fim/ramfizlel MTTORNEY A. PODEL April 8,1930.

NC- MACHINE AND OVEN LACQUERI 6 Sheets-Sheet 2 Filed Oct. 18, 1924 April8, 1930. PODEL LACQUERING MACHINE AND OVEN Filed Oct. 18, 1924 6Sheets-Sheet QQN \A nu NNN mNN

I N VE N TOR Wham/222F002! April 8, 1930. A. PODEL 1,753,998

LACQUERING MACHINE AND OVEN I Filed Oct. 18, 1924 6 Sheets-Sheet 4INVENTOR April 8, 1930. A, PODEL 1,753,998

LACQUERING MACHINE AND OVEN Filed Oct. 18, 1924 6 Sheets-Sheet 5 a @a IN g Aha/2am Fade! M ATTORNEY Patented. Apr. 8, 1930 UNITED STATES PATENTOFFICE ABRAHAM PODELOF LONG ISLAND CITY, NEW YORK, ASSIGNOR TO CHOR' CAPAND CLOSURE CORPORATION, 01 LONG ISLAND CITY, NEW YORK, A CORPORATION OFNEW YORK LACQ'UERING MACHINE AND OVEN Application filed October 18,1924.Serial No. 744,340.

The present invention relates to apparatus for coating sheet material,and more particu-' operation.

An object of the present invention is the provision of lacqueringmachines and baking ovens and assembling same to permit continuous andexpeditious handling and coating of sheet material with a minimumexpenditure of time and labor. Another object is the provision ofautomatic sheet feeding and sheet stacking devices to cooperate with thelacquering and class of work; to provide an apparatus which will coatthe respective sides of sheet material and bake same in a continuousoperation each step'of which is automatic, there by minimizing theamount of labor required in the operation.

Other and further objects of the invention will be obvious upon anunderstanding of the illustrated embodiment about to be described orwill be obvious from the accompanying drawings, or indicated in theappended claims; and' various advantages secured by the invention otherthan those hereinafter specificallyreferred to Will occur to associatedmachines to receive sheet material' one skilled in the art or becomeevident upon from trucks or the like, fez-d individual sheets to thelacquering machines, receive the individual sheets delivered by saidmachines and stack them on suitable supports which may be readilymounted on trucks.

A still further object is the utilization of a single source of power toproperly time the respective mechanisms in relation to each other; andthe utilization of a separate source of power for driving certainmechanisms whose operations are independent of the operations of othermechanisms.

A more specific object of the present invention is the provision ofapparatus adapted to receive sheets of tin or the like from a truck tofeed them individually to a lacquering machine, which coats one sideonly and delivers the sheets to a conveyor which transports them throughan oven wherein the lacquer is partially baked or oxidized; to

stacking machine which places them in position to be mounted on a truck;and to do this without utilizing manual labor in the handling of thesheet material.

the employment of the invention in practice.

In the drawings, Fig. 1 is a diagrammatic side elevation of theapparatus assembled;

Fig. 2 is a side elevation of the second oven, certain parts beingbroken away to show the internal construction.

Fig. 3 is an end View of an oven;

Figs. 4 and 5 are side elevations respectively of the front and rearends of the first oven with certain parts broken away to discloseclearly the driving mechanism;

Figs. 6 and 7 are top plan'views of the structures shown in Figs. 4 and5 respec-' tively;

Fig. 8- is a detail drawing of the sheet straightening, mechanism;

Fig. 9 is an end view of the sheet straightening mechanism shown in Fig.8;

Fig. 10 is a cross-section along line 10-10 of Fig. 5;

Fig. 11 is a detail drawing of themechanism for subjecting the chain toa substantially constant tension;

Figs. 12 and 13 are detail views of brackets,

forming supports for the rails upon which the chains slide; and

Fig. 14 is a plan View of the burners, used in the ovens as seen fromthe line 1414 of Figure 2 with the baflle plates dotted in position.

In the manufacture of various articles from sheet metal or other sheetmaterial it is desirable to lacquer or coat the sheets of raw materialprior to their being formed into finished articles. This is particularlytrue in connection with the manufacture of metallic containers andmetallic caps for other containers. In some instances the sheet materialis coated on one side only and in other instances it is coated on bothsides; in either case the sheets must be fed individually from a stackto a lacquering machine which applies a coating to one side and thendelivers the sheets to an oven for bakin purposes. If the other sidesare to be coate also, the sheets may be run through the same machines asecond time, or the second side of the sheet may be coated by running itthrough a second lacquering machine and a second oven from which theyare delivered with a permanent coating on each side.

Several types of apparatus have been used heretofore for lacquering orcoating sheet material. Some lacquer the two sides independently, othersutilize two consecutive stages, one for each side of the sheets. In

all apparatus known heretofore there has been considerable waste ofpower, due to inefficient operation, and a great loss of labor inhandling the sheets and in watching and controlling the apparatus.

The present invention overcomes the difficulties of the prior art byproviding an apparatus which receives sheet material in quantities,delivers individual sheets to the lacquering machine automatically andconstant- 1y. The sheets move continuously throu h the lacqueringmachine to an ovcnwhere t 1e coating applied is partially baked oroxidized by suitable burners at the bottom of the oven; they are thencooled and delivered to a second lacquering machine where the othersides of the sheets are coated. The sheets continue in their travel to asecond oven where the coatings on both sides are completely baked,cooled sufficiently to be handled, and delivered to a stacking machinefrom which they are removed in quantities. The entire operation from theraw material to the coated sheet is automatic and continuous in everyrespect.

A single workman can superintend the operation of all the differentmechanisms whereas heretofore several men have been required to operateapparatus for similar purposes which was of much smaller capacity. Lackof uniformity in the feeding of such apparatus and the necessity offrequent interrupthe preferred embodiment of the present invention. Asheet of tin in passing through the apparatus engages consecutively theautomatic feeding machine 1, lacquering machine 2, oven 4, a secondlacquering machine 5, a second oven 6, and stacking machine 7. Thesemachines with the exception of the lacquering machine 5 are operativelyconnected to the same source of power through clutches which permitindependent operations of the various elements. The entire group ofmachines are connected to each other by suitable conveyors 8, 9, 10, 11and 12. The various elements of theapparatus and their associatedmechanisms will now be described more specifically.

The feeding machine 1 and conveyor 8 may be similar to that shown in mycbpending application, Serial No. 729,043, filed July 30, 1924. It isadapted to receive sheet material in quantities, maintain the height ofthe stack constant, and if desired feed the sheets automatically to theconveyor 8 which in turn delivers them to the lacquering machine 2.

The lacquering machine 2 is the usual type comprising a frame 13 and apair of rollers 14 and 15, through which the sheets pass, the upperroller being supplied with lacquer from a pair of contacting rollers 16and 17, one of which is partly immersed in a suitable lacquer. Conveyor9 consisting of a series of bolts 18 mounted on shafts 21 and 22 andretained in position by pulleys 24, on shaft 21, operatively connectslacquering machine 2 with oven 4. Shaft 22 is mounted in suitablebearings 27 and 28 formed in the members 29 and 30, which are attachedto the frame of the oven 4 and held in position by braces 31 and 32. Thebelts 18 may be tightened by proper adjustment of the belt tighteners 34mounted on arms 35 extending from shaft 37 also mounted on the members29 and 30. Such adjustment may be accomplished by loosening set screws38, and changing the angular position of the arms 35 with respect toshaft 37.

An electric motor 41 operates lac uering machine 2 through a gearreduction ox 42, shaft 44, clutch 45, bevelled gears 46 and 47,sprockets 49 and 50 and chain 51. Sprocket 50 rotates shaft 52 mountedon the lacquering machine 2. Gear 54 on shaft 52 rotates shaft 21 andthe pulleys and belts mounted thereon through gear 55. Clutch 45 has asliding sleeve 56, operated by lever 57, pivoted at its center to theframe of oven 4, to engage clutch aws 58 and 59 for connecting the shaftupon which bevel gear 46 is mounted, to shaft 44.

The feeding machine 1 is directly connected to shaft 52 of lacqueringmachine 2 by without interfering with the operation of the othermachines.

The sheets are delivered from the lacquering machine 2 by the conveyor 9to oven 4 wherein the coating applied is partlyoxidized or baked so thatit'may be run through an adsides of which are bolted to the floororother suitable foundation. The upper sides of the rectangular members71 and 72 have bearings 74 and 75, to accommodate shafts 76 and 77.Suitable sprocket-wheels 78 and 79 are mounted on shafts 76 and 77 toaccommodate chains 67 and 68. A pair of wooden bumper rollers 80 and 81are mounted also on shaft 76 to act as stops for'the sheets of tinsliding on the brackets 66. Chains 67 and 68 slide upon and aresupported by rails 82 and 84, (see Figs. 6 and 7) to prevent sag and toeliminate excessive tension in the chains due to the weight of the sheetmaterial supported thereby and also the weight of brackets 66 mountedthereon. The rails may be supported in any suitable manner butpreferably they engage at their ends brackets 85 and 86 on therectangular members 71 and 72. Other supports 87 bolted to the hood 89of oven 4 and shown in Figs. 3, 12, and 13 engage the rails 82 and 84about every six feet. noted in Fig.12 that one end of each rail onsupports 87 is slotted to receive the bolts 88; this is to permit freeexpansion and contraction of the rails 82 and 84 due to changes oftemperature.

The bearings 74 and 75 are resiliently mounted on the upper portion ofthe supporting frame 69 and are slidably retained there by bars 90 and91 which are bolted to the rectangular members 71 and 72 and spacedtherefrom by members 92 and 94. Bearings 74 and 75 slide in the spacebetween the bars 90 and 91 and the upper side of the rectangularmembers. Projections 95 and 96 on bearings 74 and 75 move in slots 97and 98 to retain the bearings accurately in position at all times. Shaft76 is resiliently retained in position against the pull exerted bychains 67 and 68 by bars 99 and 100 and springs 101 and 102. Brackets104 and 105, bolted to the rectangular frames 70 and 71, form slidablesupports for the bars 99 and 100, one end of each engaging the slidablebearings.

Springs 101 and 102 are mounted on bars 99 and 100 between members 92and 94 and It will be decrease the compression of the springs, therebymcreaslng or decreasin the pressure exerted on shaft 76 to maintain 1tin its outermost position. These springs 101 and 102 are necessarybecause there is a temperature change in the ovens of as much as severalhundred degrees and a resultant change in the length of the conveyorchains of as much as several inches. It is therefore desirable to allowfree contraction and expansion of the chalns without materiallyincreasing or decreasing the tension therein. This is articularly truewith respect to oven 6, w ich is much longer than oven 4 and in whichthe increase and decrease in the lengths of chains 67 and 68 is muchgreater.

Shafts 76 and 77 are driven by motor 41 through mechanisms described,hereinafter; and these shafts through sprocket wheels 78 and 79 conveythe sheets on brackets 66 through the oven 4. At the front end of theoven 4 is a pair of stationary curved positioning members 108 and 109,mounted on the arms 110 and 111 extending from the bearing on the frame69 which engage any derangedsheets on the brackets 66 and push them intoline with the other sheets by means of the curved ends 115 and 116.

At the rear end of oven 4 a pair of reciprocation sheet straighteningmembers 117 and 118 are mounted on the extensions 119 and 120 of arms121 and 122 and engage the respective sheets as they pass andcorrecttheir alignment. A pair of brackets 124 and 125 bolted to therectangular frames 71 and 72 form pivotal supports for arms 121 and 122at their central portion, their lower portions being joined by bar 126.Bracket 125 is extended into. a U shape in which bearings 127 and 128forshaft 129 are formed and upon which cam 130 and gear 131 are mounted.Cam follower 132, on arm 122 below its pivot, is retained in engagementwith cam 130 by spring 134. Gear on shaft 77 engages gear 131 on shaft129 and rotates cam 130 to reciprocate the sheet positioning members 117and 118 through the cam follower 132 thereby correcting the position ofthe sheets as they leave the oven conveyor.

Suitable heating and cooling devices for ovens 4 and 6 are provided asshown in Figs. 2 and'3. A plurality of gas burners 133 having bafiies136 supported from the rails 82 and 84 by wires 137 distribute the heatand give uniform treatment to all material on the oven conveyor. Gas issupplied to burners 133 through pipes 138 and valves 139. A suitablequantity of air is supplied through pipes 140 and valves 141 leadingfrom the blower 145 and entering the gas pipes 138 at 140'. Valves 141may be adjusted or the pressure at the source may be varied to give asuitable supply for the proper functioning of burners 133. Since thesheets are raised to a fairly high temperature, it is desirable toreduce this to one at which they may be handled prior'to their exit fromthe ovens. Accordingly, a series of air cooling tubes 146 are connectedto the blower 145 or to a se arate source of compressed air whereby co dair is circulated between the hot sheets to reduce their temperature.Suitable flues 147 shown in Fig. 2 (but not shown in the other figuresfor simplification of the drawings) conduct the waste gases away throughthe main flue 148. Ordinarily 3 flue pipes in the hood of oven 4 aresufficient; that is one at each end and another in the middle. In thelonger oven six, eight or ten fiues joining main flue 148 are desirable.

Power for the operation of the mechanism in oven 4 is derived from theelectric motor 41 through the reduction gear box 42, gears 149 and 150,clutch 151 and shaft 152. Gear 150 is mounted on shaft 154 andoperatively connected to shaft 152 through clutch 151 which is similarto clutch 45 described hereinbefore. Shaft 152 is suitably mounted onthe rectangular members 72 and worms 156 and 157 thereon engage gears158 and 159 on shafts 76 and 77. Thus by the operation of clutch 151 bylever 153, the mechanism of oven 4 can be cut in or out independently ofthe other machines.

Gear 160 keyed to shaft 152 engages and drives gear 161 on sleeve 162loosely mounted about shaft 44. Bevel gear 164 keyed to sleeve 162engages bevel gear 165 to rotate sprocket 166 on shaft 167 which in turnoperates shafts 168 and sprocket 169 through chain 170 (see Fig. 10).Shaft 168 is mounted in a bearing 168 attached to one of the rectangularframes 72. A suitable chain tightener 171 adjustably mounted on anextension from the rectangular frame takes up the slack in chain 170.Sprocket 169 through chain 172 and sprocket 174 rotates shaft 175 whichis mounted in a suitable bearing on the frame of lacquering machine 5. Asecond chain 176 is mounted on sprocket 177 at the other end of shaft175 and on sprocket 179 which is mounted similarly to sprocket 169 butdriven from shaft 17 5. Chains 172 and 176 have projections 180 forengaging the sheets conveyed by brackets 66 and to convey them to thelaequering machine 5.

An additional shaft 181 mounted in bearings 182 and 184 on extensions185 and 186 from rectangular frames 71 and 72 has pulleys 187 mountedbetween chains 172 and 176. Pulleys 189 on shaft 175 drive shaft 181through belts 191. Shaft 194 mounted on the lacquering machine 5 has aseries of belt tighteners 192 to take up sag in chains 172 and 17 6 andbelts 191.

In the operation of the conveyor 10 the chains 172 and 17 6 engage thesheets by the projections 180 and move them until they are frictionallyengaged by the belts 191 which move at a greater rate than chains 178and therefore move the sheets away from the projection 180 and feed themto the lacquering machine 5 with the rear edges out of en agement withprojections 180 preventing t ereby any buckling of the sheets.

Lacquering machine 5 with its conveyors 10 and 11 is similar in allrespects to lacquering machine 2 and its conveyors 8 and 9 exceptingthat the lacquering machine 2 and its conveyors are driven by motor 41while the lacquering machine 5 is driven from motor 197 through pulleys198 and belts 199 and 200. Shaft 52 is driven by belt 199 whereas inlacquering machine 2 it is driven by chain 51.

Oven 6 is similar to oven 4 excepting that it is approximately threetimes as long and the sheets of tin remain therein about three times theperiod necessary in oven 4. In this oven, the lacquer on both sides ofthe sheet is completely baked after which the sheets are exposed to theair cooling tubes 146 and their temperature reduced sufficiently to behandled. The various mechanisms of oven 6 are driven by the electricmotor 41 through gear box 42, gears 149 and 150, shaft 154, clutch 202,and shaft 204. Clutch 202 is similar to clutches 45 and 151.

The stacking machine 7 is adapted to receive the sheets from conveyor 12and place them on the stack 205 in the manner fully disclosed in mycopending application, Serial N 0. 683,930, filed January 2, 1924.

In the operation of the apparatus described herein, a stack of tin whichmay weigh several hundred pounds is moved by means of a truck under thefeeding machine 1 which is then operated as described in my copendingapplication referred to hereinbefore to raise the stack from the truckto a position from which the sheets are fed individually to the conveyor8. The lacquering machine 2 receives the sheet between the rollers 14and 15, the upper one of which applies a coating of lacquer to the uppersurface of the sheet. The conveyor 9 receives the sheets from thelacquering machine and delivers them to the pockets between brackets 66of the conveyor of oven 4. The sheets are then moved b this conveyorover the burners 133 for a period of about five minutes at which timethe coating applied by lacquering machine 2 is partially oxidized orbaked and is sufficiently hard to prevent their being sticky. Prior totheir exit from the oven 4 they pass over the air cooling tubes 146 andtheir temperature is reduced. The conveyor 10 receives the sheets fromthe brackets 66 with the lacquered side down and delivers them to thelacquering machine 5 which coats the upper sides of the sheets anddelivers them to conveyor 11. The brackets 66 on the conveyor mechanismof oven 6 receives the sheets from the conveyor 11 and passes them overburners 133 for a period of fifteen minutes about three times as long asthe baking period in oven 4 whereupon coatings of lacquer on both sidesof the sheet are completely baked and oxidized.

The sheets arelthen cooled b means of the air cooling tubes 146 and deivered to the conveyor 12. The stacking machine 7 receives the sheetsfrom conveyor 12 and places them upon the stack 205, at the same timelowering the stack an amount corresponding to the thickness of thesheet. When a considerable quantity has accumulated inthelaced under thestackin stack, a truck is machine and the ta the truck moved.

le is lowered to the top o f It will be seen that the present inventionprovides an apparatus for coating sheet material completely automatic inall its features. The various machines are simple in construction easyto manufacture from readily ob; tainable material. Furthermore, themachines may be cut in or out without afl'ecting the operation of othermachines. The inven and not in a limiting sense as the scope of theinvention is defined in the following claims:

Having thus described my invention, what I claim is:

1. In an apparatus of the class described in combination, a machine forcoating sheet material, automatic means for supplying individual sheetsto said coating machine, an oven adapted to receive the sheets from thecoating machine for partially baking the coating thereon, a secondcoating machine adapted to receive the sheets from said oven for coatingthe other side of the sheet material, a second oven adapted to receivethe sheets from said second coating machine, an independent source ofpower for said second coating machine, and a common source of power forthe other elements of the apparatus.

2. In an apparatus of the class described, in combination, a machine forcoating on side of the sheet material, automatic means for feedingindividual sheets from a stack to said coating machine, an oven forpartially baking the coating on the sheets received from the coatingmachine, a. second coating machine for coating the other side of thesheet material received from the oven, a second oven for receiving thesheets from the second coating machine and'for completely baking bothsides of the sheets, asource of power for said second coating machine topermit independent operation thereof, a common and the lacquered sheetsare re source of power for the other elements of the apparatus, anddevices for controlling certain of said machines connected to the commonsource of power without affecting other machines.

3. In an apparatus of the class described, in combination, a machine forcoating one side of sheet material, automatic means for feedingindividual sheets to said coating machine, an oven for baking thecoating on the sheets received from the coating machine, a secondcoating machine for coating the other side of the sheet materialreceived from the first oven, 3. second oven for completely baking thecoating on both sides of the sheets received from said second coatingmachine, a stacking machine associated with said second oven to receiveand stack the sheets received therefrom, a source of power for saidsecond coating machine, and a common source of p'owerlf or the, otherelements of said apparatus. f ff l. Inja'n "ap ratus of the classdescribed, in combinatie a machine for coating one side of sheetmaterial, an oven for receiving the sheet material and for baking thecoating thereon, a se"on'd coating machine for coating the other side ofthe sheet material received from said oven, a' second oven forcompletely baking the coating on both sides of-the sheets received fromthe second coating machine, a

stacking machine associated with said second oven adapted to receive andstack the sheets received therefrom, a source of power for said secondcoating machine, and a common source of power for the other elements ofsaid a paratus.

5. n an apparatus of the class described, in combination, a machine forcoating one side of sheet material, means for supplying sheets to saidcoat ng machine, an oven for partially baking the coating appliedthereto having a conveyor mechanism adapted to receive sheet materialfrom said coating machine, and reciprocat ng means at the delivery endof said oven for aligning said sheet-s prior to their delivery toanother machine.

6. In an apparatus of the class described, in combination, a machine forcoating one. side of sheet material, means for supplying sheets to saidcoating machine, an oven for baking the coating applied thereto having aconveyor mechanism adapted to receive sheet material from said coatingmachine, an additional coating machine for receiving the sheets directlyfrom the conveyor mechanism in said first oven, an oven for coating andbaking the other side of the sheet material re ceived from said secondcoating machine, and a reciprocating sheet aligning device on thedelivery end of each of said ovens for aligning the sheets leaving theovens.

7. In an apparatus of the class described,

in combination, a machine for coating sheet machine, an automaticfeeding machine for supplying sheets individually to said conveyor froma stack, an oven having conveyin devices adapted to receive individual seets from said coating machine, and means on the forward end of saidoven adapted to engage the respective ends of said sheets for aligningsaid sheets prior to their entrythereto.

8. In an apparatus of the class described, in combination, a machine forcoating sheet material, means for supplying sheets from a storage supplyindividually to said coating machine, mechanism for transferring saidsheets individually from said coatin machine, an oven havin conveyingevices adapted to receive individual sheets from said transferringmechanism, and means on the forward end of the said oven for engagingthe ends of the sheets to position them properly on said conveyingdevices.

9. In an apparatus of the class described, in combination, a machine forcoating one side of the sheet material, means for supplying sheets froma storage supply to said coating machine, an oven for baking the coatingapplied thereto having a conveyor mechanism adapted to receive sheetmaterial from sald coating machine, an additional coating machine adated to receive sheets from said conveyor or coating the other side ofsaid sheet material and reciprocating means at the delivery end of eachof said ovens for positionin the sheets as they leave the ovens.

10. ii an apparatus of the class described the combination, a machinefor coating one side of sheet material, a conveyor leadin to saidcoating machine, an automatic feed ing machine for feeding sheetsindividually from a stack to said conveyor, an oven for baking thecoating applied thereto, having a conveyor mechanism adapted to receivesheet material from said coating machine, automatic means for turningsaid sheets to permit the other side to be coated, an additional coatingmachine for coatin the other side of sheet material, and an additionaloven for bakin the coating on said sheet material.

11. 11 an apparatus of the class described, in combination, a machinefor coating one side of sheet material, an automatic feeding machine forfeeding sheets from a storage supply to said coating machine, an ovenfor partially baking the coating ap lied thereto having a conveyormechanism a apted to receive sheet material from said coating machine,and reciprocating means for positioning the sheet on said conveyor atone end of said oven.

12. In a machine of the class described, the combination of a coatingmachine for applying lacquer to one side of sheet material, an automaticfeeding machine for feeding sheet material from a stored supplyindividually to said coating machine, an oven having a conveyor thereinfor receiving the sheets from said coatin machine, a second oven and acoating mac ine between said ovens ada ted to coat the other sides ofsaid sheets an deliver them to the second oven, an independent source ofpower for driving said second coating machine, a shaft extending alongthe si es of said oven operatively connected to drive the mechanismswith the exception of the second coating machine, and means fordisconnecting the respective mechanisms from said shaft inde endently.13. In a machine 0? the class described, th combination of a machine forapplying lacquer to one side of sheet material such as tin and the like,an automatic feeding machine for feeding said sheet material from astored supply individually to said lacquerin machine, an oven having aconveyor therem for receiving the sheets from said lacquering machine, asecond oven and a lacquering machine between said ovens adapted to coatthe other sides of said sheets and deliver them to the second oven, ashaft extending alon the sides of said oven operatively connecte todrive the conveyors in said ovens, and means for disconnecting therespective conveyors in said ovens from said shaft independently.

14. In a machine of the class described, the combination of a lacqueringmachine for applying lacquer to one side of sheet material, an automaticfeeding machine for feeding sheet material from a stored supplyindividually to said coating machine, an oven having a conveyor thereinfor receiving the sheets from said coating machine, a second ovenlikewise having a conveyor therein, a coating machine between said ovensadapted to coat the other sides of said sheets and deliver them to thesecond oven, and reciprocating means adapted to position the sheets onthe conveyors in the said ovens.

15. In a machine of the class described, the combination of a lacqueringmachine for coating one side of sheet material such as tin and the like,an oven having a conveyor therein for receiving the sheets from saidcoating machine, a second oven likewise having a conveyor therein, alacquering machine between said ovens adapted to receive the sheets fromthe conveyor in the first oven, coat the other sides thereof and deliverthem to the conveyor in the second oven, and reciprocating means ada tedto engage the ends of said sheets on sai conveyors to position same.

16. In an apparatus of the class described, the combination of a machinefor coating sheet material, an oven for partially baking the coatingapplied thereto having a conveyor mechanism adapted to receive sheetmaterial from said coating machine, and reciprocating means forpositioning the sheets on said conveyor at one end of the oven.

ABRAHAM PODEL.

